Question

Resolva : X2 - 2x = 0 ..

Answer 1

x^2 - 2x = 0

x  ( x - 2) = 0   

Então x= 0  ou x = 2

Answer 2

X²-2x=0

Delta=b²-4.a.c
Delta=-2²-4.1.0
Delta=4

x=-b+/- raiz de delta
--------------------------
             2.a

x=2+/- raiz de 4
---------------------
         2.1

x=2+/-2          x'= 2/2+2/2 => 4/2 => x'=2
----------- =>
     2                x''=2/2-2/2 => 0/2 => x''=0/2


S = { 2,0/2 }